This study utilized monthly mean daily values of global solar radiation, temperature and cloud cover at eight locations in Nigeria and developed an empirical correlation for the estimation of global solar radiation at different locations. This research presents the comparison between the observed and the predicted values under different geographical and varied meteorological conditions. The comparisons are made using standard statistical tests, namely mean bias error (MBE), root mean square error (RMSE) and Standard error (SE). A correlation coefficient (r) ranges from 0.823- 0.978 and correlation of determination (R2) ranges between 0.677 and 0.959 with a maximum standard error of 0.0573 and RMSE values lie in the range from 0.029 to 0.054 with low MBE across the eight stations.
